With the rapid development of the communication technology, the increase of the users, more and more multi-task requirements will be presented by users who want to take advantage of the wireless access. It proposed new requirements and challenges for multi-users to share limited spectrum resources and ensure the Quality of Service (QoS) of wireless communication network. Based on the successful application of double clocks control to ALOHA, we try to apply this theory to the CSMA protocols. Meanwhile, we set the probability of sending packet and the probability of sensing channel to improve system performance. But in the CSMA protocol, the conflict between packets is inevitable. Then we introduce binary tree conflict resolution mechanism which could resolve the conflict and resent the information packets in conflict. Based on the above two considerations, we proposed a double clocks multi-channel two-dimensional probability CSMA based on binary tree conflict resolution mechanism which improves the controllability of the system, the channel utilization, system security, and reliability of packet transmission, meets the different priority of different QoS requirements. By modeling analysis, the analytical results and simulation results show that the theoretical analysis are consistent with the simulation experiments and has a better performance in many aspects.